[GHC] #12718: Segmentation fault, runtime representation polymorphism

[GHC]

#12718: Segmentation fault, runtime representation polymorphism
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"eefe86d96d40697707c3ddfb9973a30a1897241f/ghc" eefe86d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="eefe86d96d40697707c3ddfb9973a30a1897241f"
 Allow levity-polymorpic arrows

 This cures Trac #12668 (and cures the Lint errors you get from
 Trac #12718).

 The idea is explained in Note [Levity polymorphism], in Kind.hs
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12718#comment:2>
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